A combination process for deep desulfurization and refining of liquefied petroleum gas

A technology for deep desulfurization of liquefied petroleum gas, applied in the petroleum industry, gas mixture processing, gas fuel, etc., can solve the problems of reducing sulfur content, unreached, alkali residue discharge, etc., and achieve high desulfurization depth and no waste alkali residue Emissions, low investment effect
CN104403688BInactive Publication Date: 2016-05-11XI'AN PETROLEUM UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XI'AN PETROLEUM UNIVERSITY
Publication Date
2016-05-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a deep desulfurization technology for liquefied petroleum gas. A carbonyl sulfate water-washing tower is adopted to remove hydrogen sulfate and carbonyl sulfate in the liquefied petroleum gas respectively according to different nature characteristics of sulfides contained in the liquefied petroleum gas, small-molecular mercaptan in the liquefied petroleum gas is converted into disulfides with higher boiling points through an oxidation tower, then the sulfides and a liquefied petroleum gas product are separated with a rectification method, sulfur-enriched C5 or heavy C4 components are arranged at the tower bottom, and the ultra-low-sulfur liquefied petroleum gas product is arranged at the tower top. The content of sulfur in the liquefied petroleum gas is decreased to be lower than 5 mu g / g in the process, the desulfurization rate is high, and no alkali residue is discharged.
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Description

technical field

[0001] The invention belongs to the technical field of petrochemical industry, and relates to a combined process method for petroleum refining and desulfurization and refining of by-product petroleum liquefied gas in chemical enterprises. Background technique

[0002] Liquefied gas from catalytic cracking, delayed coking, hydrogenation and catalytic reforming devices in the petroleum refining process contains a large amount of sulfides, mainly including hydrogen sulfide, mercaptans, sulfides, carbonyl sulfide and disulfides, etc., their Existence will not only lead to a decline in product quality, but also seriously affect its performance, such as corrosion caused by the transportation and storage process, environmental pollution caused by the combustion process, etc. In particular, catalytic cracking and coking liquefied gas, which is used as a raw material for petrochemical processes (such as MTBE production, alkylation process and polypropylene process, et...

Claims

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